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Статті в журналах з теми "Effet de couplage d’ondes"
Genet, Cyriaque. "Chiralité et optique plasmonique." Reflets de la physique, no. 76 (September 2023): 4–10. http://dx.doi.org/10.1051/refdp/202376004.
Повний текст джерелаBrageu, Rémi. "Couplage macrophotographie et photogrammétrie." Revue Française de Photogrammétrie et de Télédétection, no. 215 (August 16, 2017): 81–87. http://dx.doi.org/10.52638/rfpt.2017.345.
Повний текст джерелаThiaville, André. "La chiralité en nanomagnétisme et électronique de spin." Reflets de la physique, no. 76 (September 2023): 11–17. http://dx.doi.org/10.1051/refdp/202376011.
Повний текст джерелаBotet, Lucile, and Samuel Renaud. "Étude et modélisation du couplage PV/Hydroélectricité." E3S Web of Conferences 346 (2022): 03007. http://dx.doi.org/10.1051/e3sconf/202234603007.
Повний текст джерелаDelpech, M., and P. Bonnet. "Effet de l'hypoxie sur le couplage pharmacomecanique de l'artere pulmonaire de lapin." Annales Françaises d'Anesthésie et de Réanimation 16, no. 6 (September 1997): 819. http://dx.doi.org/10.1016/s0750-7658(97)86464-7.
Повний текст джерелаBalandraud, Xavier, André Chrysochoos, Sylvain Leclercq, and Robert Peyroux. "Effet du couplage thermomécanique sur la propagation d'un front de changement de phase." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 329, no. 8 (August 2001): 621–26. http://dx.doi.org/10.1016/s1620-7742(01)01376-9.
Повний текст джерелаVAUCLIN, S., B. MOURIER та T. WINIARSKI. "De l’intérêt de coupler méthodes géophysiques et carottages sédimentaires pour l’étude des sédiments fluviaux". Techniques Sciences Méthodes 11 (20 листопада 2019): 33–49. http://dx.doi.org/10.36904/tsm/201911033.
Повний текст джерелаHemici, M., R. Saoudi, E. Descroix, E. Audouard, and P. Laporte. "Techniques de frustration de fluorescence dans le VUV : Effet du couplage spin-orbite dans l'excimère de krypton." Annales de Physique 19 (October 1994): C1–55—C1–56. http://dx.doi.org/10.1051/anphys/1994016.
Повний текст джерелаDepresle, Bruno. "Les fondements et les conditions de la mise en œuvre du zéro artificialisation nette." Administration N° 280, no. 4 (January 18, 2024): 68–70. http://dx.doi.org/10.3917/admi.280.0068.
Повний текст джерелаDumazy, Y., C. Fernandez, JP Amoureux, and L. Delmotte. "Effet du couplage dipolaire sur les spectres RMN à Tangle magique de 27Al et 23Na dans une iodosodalite." Journal de Chimie Physique 92 (1995): 1855–60. http://dx.doi.org/10.1051/jcp/1995921855.
Повний текст джерелаДисертації з теми "Effet de couplage d’ondes"
Beauvais, Romain. "Effets non linéaires acoustiques et couplages fluide-structure dans les guides d’ondes : application à des conduites de compresseurs alternatifs." Thesis, Le Mans, 2019. http://www.theses.fr/2019LEMA1015.
Повний текст джерелаIn the oil, chemical and gas industries, the manufacturing processes induce the use of pipelines subjected to gases at high pressure and temperature. The gas is transported by reciprocating compressors connected to these pipelines, whose normal operation generates the propagation of acoustic waves causing structural vibrations by coupling between the gas column and the piping system. Understanding the behavior and controlling the level of these vibrations is a major challenge because of their impact on the safety of the installations. However, the increase in the rotational speeds of new compressors has accentuated the generation of non-linear acoustic phenomena that can occur locally at section discontinuities (orifice, expansiona areas) or along the propagation in long pipes. A one-dimensional numerical model of non-linear propagation in a pipe network with cross-section discontinuities is developed in the time domain. This model is based on the choice of a FDTD (Finite Difference Time Domain) scheme adapted to weakly non-linear propagation with viscothermic losses in wave guides.In the meantime, a study is carried out on the vibroacoustic coupling between the fluid and a bent pipe. The propagation of plane acoustical waves generates the appearance of localized forces at the bends of a pipe. Vibrations are then induced by the unbalancing of these forces. The measurement of modal parameters (mode shapes, frequency and damping) is carried out by means of vibration tests at strategic points on the pipe. Then an inverse method is proposed in order to estimate the internal pressure field, based on non-intrusive acceleration measurements
Doli, Valentin. "Phénomènes de propagation de champignons parasites de plantes par couplage de diffusion spatiale et de reproduction sexuée." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S139/document.
Повний текст джерелаWe consider organisms that mix sexual and asexual reproduction, in a situation where sexual reproduction involves both spatial dispersion and mate finding limitation. We propose a model that involves two coupled equations, the first one being an ordinary differential equation of logistic type, the second one being a reaction diffusion equation. According to realistic values of the various coefficients, the second equation turns out to involve a fast time scale, while the first one involves a separated slow time scale. First we show existence and uniqueness of solutions to the original system. Second, in the limit where the fast time scale is considered infinitely fast, we show the convergence towards a reduced quasi steady state dynamics, whose correctors can be computed at any order. Third, using monotonicity properties of our cooperative system, we show the existence of traveling wave solutions in a particular region of the parameter space (monostable case)
Cui, Dongze. "A Contribution to Vibroacoustics of Highly Heterogeneous Metastructures through Wave Finite Element Scheme." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0031.
Повний текст джерелаThe research aims to extend existing studies for heterogeneous metastructures with high contrast and high dissipation features. The multi-scale dynamics, vibroacoustic indicators, wave coupling effect, and high-order waves of heterogeneous metastructures are investigated within the wave-based frameworks. The wave-based models for Highly Contrasted Structures (HCS) and Highly Dissipative Structures (HDS) are explored. Various methods for computing the vibroacoustic indicators, such as the wavenumber space, Damping Loss Factor (DLF), and Sound Transmission Loss (STL), are reviewed. Special attention is placed on the Asymptotic Homogenization Method (AHM) exploiting the Zig-Zag model and homogenization technique to predict the multi-scale dynamics of HCS by the bending wavenumbers. Meanwhile, the analytical Transfer Matrix Method (TMM) and its generalization for complex structures by the Finite Element (FE) model (General Transfer Matrix Method, GTMM), the semi-analytical General Laminate Model (GLM) employing Mindlin's displacement theory, the numerical Wave Finite Element (WFE) scheme are presented. Evaluation on the robustness and accuracy of AHM and GLM is made by comparing the wavenumber space and DLF with the reference WFE method. The Nonlinear Eigenvalue Problem (NEP) in the WFE scheme for waves propagating in varying directions is solved by a Contour Integral (CI) solver, the complex wavenumbers are tracked based on the energy continuity criteria in the frequency domain. The validity limits of AHM and GLM are verified. The feasibility of applying the WFE method to sandwich structures with non-homogeneous components is shown using the classical FE-based Power Input Method (PIM-FEM). The WFE framework is extended for accurately predicting the global DLF of HDS. It starts by deriving the forced responses of a Unit Cell (UC) representative of the periodic structure when excited by an impinging wave. Then it computes the DLF of the wave via the power balance equation. By employing the Bloch expansion, the response to a point force applied to the periodic structure is decomposed in the Brillouin zone, allowing the prediction of total response via integration over the wavenumber space. The global DLF is derived based on the principle of PIM. For HDS, results of GLM are exploited for validating the wave DLF, the PIM-FEM approach is provided as reference approach for the global DLF. The shrinking influence of bending waves on the DLF estimation for HDS is discussed, as well as the importance of Bloch mode orders. \newline Sound transmission coefficients can be exploited to depict the contribution from the wavenumber space to the STL of the heterogeneous metastructures. The WFE method is applied to study the wave coupling mechanisms influencing the sound insulation performance of HCS and HDS, as well as the importance of symmetric motion to the sandwich structures with a very thick soft core. The same approach is applied to waveguides with complex cross-sections to investigate the wave coupling effect and high-order waves on the accurate STL estimation by analytical TMM, WFE, and GTMM approaches. Special attention is paid to curved periodic structures, the bending-membrane coupling mechanisms influencing the STL are also investigated
Faure, Gérôme. "Couplage micro/hydro pour la simulation d’ondes de choc et de détonation." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1063/document.
Повний текст джерелаThis thesis studies mesoscopic models adapted to the simulation of shock and detonation waves in fluids. These phenomena require systems sufficiently large to observe the complex processes occurring in this context. The aim is thus to increase the accessible time and length scales of microscopic methods, accurate but expensive, while preserving their essential properties. To this end, the multiscale coupling of methods at different resolutions allows to finely describe a specific region, limiting the computational cost. In particular, we study Smoothed Dissipative Particle Dynamics (SDPD) which couples a particle discretization of the Navier-Stokes equations and thermal fluctuations that scale consistently with the resolution. The SDPD equations are reformulated in terms of internal energies, which increases the structural similarity with Dissipative Particle Dynamics with Energy conservation (DPDE). We adapt numerical schemes for DPDE to the context of SDPD in order to ensure energy conservation and stability. We study the statistical properties of SDPD and determine estimators for temperature and pressure. The size consistency in SDPD is established for equilibrium and shock waves, which leads us to propose a multiscale coupling of SDPD at different resolutions. Finally, its physical relevance is illustrated by simulating micro-jetting and detonation waves
Mazzamurro, Aurélien. "Étude du couplage piézo-magnétique dans les guides d’ondes électro-acoustiques hyperfréquences : application aux capteurs de champ magnétique." Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0008.
Повний текст джерелаThin-film piezo-electro-magneto-elastic heterostructures stand out as promising candidates in the field of spatially resolved, low-intensity magnetic field detection at room temperature. Thus, this thesis focuses on the study of piezomagnetic coupling in microwave electro-acoustic waveguides based on nanostructured thin films with uniaxial anisotropy, deposited on piezoelectric substrates. Firstly, the investigated structures consist in a TbCo2/FeCo multilayer stack deposited on a ST-X90° Quartz substrate, to exploit the horizontal transverse mode presenting the highest sensitivity. The possibility to induce, via the magnetic field, an acoustic mode conversion, potentially usable in the design of ultra-sensitive magnetic field sensors, is also demonstrated. In addition, this study validated the developed theoretical piezo-magnetic model, by measuring the phase velocity variations of the guided elastic waves as a function of the intensity and direction of the applied magnetic field. Then, two measurement concepts are proposed in order to improve the resolution of the sensor measurement, which depends essentially on the transit time of the elastic wave in the magneto-elastic layer: the acoustic time domain reflectometry and the exploitation of a cavity mode located in the magneto-elastic layer. Finally, the optimization of the uniaxial anisotropy/magnetostriction couple of the TbCo2/FeCo multilayer stack is addressed, as it plays a major role in the sensitivity and dynamics of the studied sensors
Mazzamurro, Aurélien. "Étude du couplage piézo-magnétique dans les guides d’ondes électro-acoustiques hyperfréquences : application aux capteurs de champ magnétique." Thesis, Ecole centrale de Lille, 2020. http://www.theses.fr/2020ECLI0008.
Повний текст джерелаThin-film piezo-electro-magneto-elastic heterostructures stand out as promising candidates in the field of spatially resolved, low-intensity magnetic field detection at room temperature. Thus, this thesis focuses on the study of piezomagnetic coupling in microwave electro-acoustic waveguides based on nanostructured thin films with uniaxial anisotropy, deposited on piezoelectric substrates. Firstly, the investigated structures consist in a TbCo2/FeCo multilayer stack deposited on a ST-X90° Quartz substrate, to exploit the horizontal transverse mode presenting the highest sensitivity. The possibility to induce, via the magnetic field, an acoustic mode conversion, potentially usable in the design of ultra-sensitive magnetic field sensors, is also demonstrated. In addition, this study validated the developed theoretical piezo-magnetic model, by measuring the phase velocity variations of the guided elastic waves as a function of the intensity and direction of the applied magnetic field. Then, two measurement concepts are proposed in order to improve the resolution of the sensor measurement, which depends essentially on the transit time of the elastic wave in the magneto-elastic layer: the acoustic time domain reflectometry and the exploitation of a cavity mode located in the magneto-elastic layer. Finally, the optimization of the uniaxial anisotropy/magnetostriction couple of the TbCo2/FeCo multilayer stack is addressed, as it plays a major role in the sensitivity and dynamics of the studied sensors
Spathis, Panayotis. "Couplage interplan dans Bi2Sr2CaCu2O8+∂ : effet du désordre et du champ magnétique." Phd thesis, Ecole Polytechnique X, 2006. http://tel.archives-ouvertes.fr/tel-00465554.
Повний текст джерелаBERRUYER, DESIROTTE NICOLE. "Contribution a l'etude des enveloppes circumstellaires : effet du couplage grains-gaz." Nice, 1987. http://www.theses.fr/1987NICE4157.
Повний текст джерелаMondain, François. "Source intégrée de lumière comprimée aux longueurs d’ondes des télécommunications." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4013.
Повний текст джерелаRecent progress in quantum physics predicts a future revolution in the fields of communication, sensing, computing and simulation which rely on our hability to generate and control quantum states such as entanglement. Discovered more than thirty years ago, squeezed light has rapidly became an important tool for the implementation of quantum technologies, but its use still suffers from a lack of compactness wich limits the growth of quantum photonics realisations. To tackle this issue, we developpe a compact photonic platform to generate and detect squeezed light at telecom wavelengths. It is build upon an association between off the shelf telecom components and integrated optics on lithium niobate (LiNbO3) allowing a compact, and easy reconfigurable setup, without any alignment (plug-and-play). With this original aprroach, we directly measure up to -2dB shot noise reduction for a CW pump power of 40 mW, opening the way to out-of-the lab continuous variable experimentations.In order to fully understand the limits of our experimental setup, we also investigate the photorefractive properties of the LiNbO3, which means his intensity dependant refractive index. This effect could be a great issue in CV experiments, where high pump powers near visible wavelengths are needed. For this reason, we also study precisely the photorefraction in order to optimise the generation and the detection of squeezed light in integrated lithium niobate photonics circuits
Allivy, Kelly Olivier d'. "Détection et excitation d’ondes de spin dans des microstructures de couches ultraminces Y₃Fe₅O₁₂/métal à fort couplage spin orbite." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS263/document.
Повний текст джерелаThe aim of this thesis is to study the excitation, the propagation and the detection of spin waves into ultrathin Y₃Fe₅O₁₂ (YIG) films. Our approach consists in interacting with the YIG magnetization dynamics thanks to spin polarized electronic transport phenomena related to spin Hall effect (SHE) that occurs within normal metals (NM) which have a large spin orbit coupling.To do so, we first grew epitaxially, by pulsed laser deposition, nanometer thick YIG films. Having ultrathin magnetic films is indeed necessary to be able to use lithography and microfabrication technics in order to develop magnonic devices.Studying these films by ferromagnetic resonance (FMR) allowed us to quantify the Gilbert magnetic damping constant, which is down to 2∙〖10〗^(-4) for the best 20 nm thick films. This value is comparable to which is reported for micrometer thick YIG films grown by liquid phase epitaxy and is only one order of magnitude higher than the bulk YIG damping (α = 3∙〖10〗^(-5)). Inductive measurements performed with a vectorial network analyzer show that spin waves can propagate over hundreds microns through such thin films. The suitability of 20 nm thick YIG films for magnonic applications is therefore confirmed by this result.In order to detect/excite spinwave by exploiting SHE, we have deposited different metals (Pt, Pd, CuBi) on our YIG films, thus obtaining YIG|NM bilayers. We have performed a nonlocal detection of spin waves based on inverse SHE and spin pumping phenomena. From the FMR analysis, we also measured the spin mixing conductance g_(↑↓) that quantify the efficiency of spin pumping.To answer the question of the origin of magnetoresistance observed into YIG|NM bilayers, intrinsic or extrinsic origin (ie. induced by the magnetic polarization of the NM), we have measured the X-ray magnetic circular dichroism of YIG|Pd bilayers at the K-edge of Pd. These measurements do not show any induced magnetic moment for YIG to Pt for a resolution of 〖10〗^(-5) μ_B/atom. Combining this result with magnetotransport measurements performed on the same samples, allowed us to show that the spin pumping between a ferromagnetic insulator and a nonmagnetic metal could explain (without any magnetic proximity effects) spin Hall magnetoresistance effects observed into these bilayers.We studied the magnetization dynamics of YIG and YIG|NM nanodisks by magnetic resonance force microscopy. This study has shown that the nanostructuration performed on these films doesn’t affect such parameters as α and g_(↑↓), the geometrical confinement even leads to suppress the linewidth inhomogeneous broadening (ΔH_0).Then, we injected a continuous electrical current through the NM. Using the spin transfer torque of the spin current thus created into the NM by direct spin Hall effect, it allowed us to modified (increased/decreased) the FMR mode’s linewidth of a YIG|NM microdisk. After reaching a critical current, we managed to enable (without any RF excitation) a regime of magnetization auto-oscillations into the YIG. This last result, which confirms the ability of exciting the YIG magnetization dynamics by spin transfer torque, is very promising for the integration of magnonic devices into electronic circuits